Improvement in miter-dovetailing machines



UNITED STATES PATENT GEEICE.

FRANKLIN A. GLEASON, OF NEV YORK, N. Y

IMPROVEMENT IN MITER-DOVETAILING l MACHINES.

Specification forming part of Letters Patent No. 43,767, dated August 9, 1864.

To all whom it may concern Beit known that I, FRANKLIN A. GLEA- soN, of the city, county, and State of New York, have, invented a new and valuable Improvement in Miter-Dovetailing Machines 5 and I do hereby declare the following to be a full, clear, and exact description of the construction and operation of the same, reference being had to the accompanying drawings, inaking part of this specification, and to the letters of reference marked thereon, in which- Figure I is a perspective view, Figs. 2 and 4 are sectional elevations, and Fig. 3 a plan of one part of it.

The nature or character ot' my invention consists in having two carriages, each carrying a series of miter and dovetail cutters so arranged and combined that one series forms part ot' a miter-dovetail joint upon one end of any piece of lumber, and the other series a corresponding part of the joint upon the opposite end, or at such distance therefrom as it may exceed the length of work desired; also, in such improved form of cutters and such construction and arrangement ot some of its parts that it may be adjusted more easily and with greater certainty, and also adapted to a greater variety of work.

To enable others skilled in mechanics to make and use my invention, I will proceed to describe its construction and operation.

The two parts ofthe machine A Af, Fig. 1, I set upon a base, B, having ways (t a extending right and left, to which one part is irmly bolted. The other is movable to any distance the length of work may require. The sides 1) D D D of each frame are grooved upon the inner side, and form ways in which the carriages run. These ways are coupled together by arches F F F F, set such distance apart as to admit between them any width ot' lumber required.

(Jr G are clamp bed-pieces, which form an inverted base, to which the boa-rd Eis secured for working by the clamps, which are formed of two bars, H H', above the bed,-and two below the board, (part ot'one seen at 1),) connected by screws at each end. They are operated by cam-levers I I', the board being fastened by turning up, as I.

Upon the forward end ot' the carriage C, I tix an angular gouge-cutter, c, at such height as to score away a large portion of the wood, as

indicated by the line d d, Fig. 2. Immediately following this upon the lel't side is a cutterstock, f, to which I x the miter-cutter c by cap upon the back. This stock being upon the forward or face side of the cutter, its top is a base from which by pattern or templet the cutter may be always set to the correct height and angle. The position may be reversed, the cap put upon the face side, and made to answer the same purpose by guides, which shall always bring it to the same position. Next in order is the dovetail-cutter stock J, carrying cutters 1 2 3, No. l being simply an incision-cutter, which, combined with No. 2, cuts out a core, i, Fig. 2. Back of these the face of the stock is formed vto the line h, Fig. 2, and to it the cutter 3 is fastened, which cuts theangle g. Following this is the cutter-stock K, whose face is upon the opposite side and formed to the line It, carrying the cutter 4, which forms the angle m, completing the groove. The portion of the carriage which forms the base L for thesestocks has such an inclination that when the stocks are moved downward from the lines h k to the dotted lines h Ir, to work thicker lumber, they work correspondingly deeper. 0n the other carriage, C', the gouge'and miter cutters are thc same as those before described, except rcversed in position. ter is a stock, N, carrying the dovctail-cuttcrs 5 6 7, .which cut to the lines a n, Fig. 2, forming the outer side of the tongue. The number of these cutters may be more or less, according to the character ot' the work. Lastly, the cutter-stock O, having two critters s t together in the form of the letter V, which cut to the lines o o, forming the inner side of the tongue. These cutters have hitherto been made in one 5 but when set sufficiently oblique to insure smooth work the angle s is so acute that there is great diiiiculty in sharpening. This form also admits of adjustment, which obviates the necessity for an exact form in grinding. two stock arc not set upon inclines like the others, but upon a base, R, Fig. 2, parallel with the miter W X, so that 'change ot' position does not change the length of work, lthe length of the tongue being varied by setting the miter-cutter higher or lower. The dovetail-cutter stocks J K N O, being adjustable to different sizes ot' work, I provide stops to -determine the ditt'erent positions. P, Fig. f5,

Following the miter-cut` is one with sides of diiierent width from the screw upon which it turns. Other devices may be used; but the simplest form is a pin inserted in holes provided at the proper positions, as r r r, one pin servin g for all the stocks. The dovetail cutters 2 3, &c., are of peculiar construction, combining two in one, which ad mits of a thin and oblique edge without terminating in a frail point, and is also much more convenient to adjust.

The clamp bedpieces G G' are not formed in one piece with the arches which support them, but are constructed separately and bolted to seats provided for them, as at G', Fig. l, by which arrangement they may be adapted to dovetail drawers, the fronts of which are of thicker lumber than the sides.

Fig. 4 is a sectional elevation showing the adjustment.

G represents the bed bolted to its seat in the arch F, which is the position for ordinary Work.

G shows the bed elevated by a piece, S, lfeng inserted between it and the seat, of-such thickness as the dra\veriront T exceeds the side U in thickness. This adjustability also admits of adaptation to cutting miters ot any angle greater than a right angle by inserting wedge-shaped pieces of such inclination as to produce the desired angle. Most of the cutters are set so that their cutting-edges form an acute angle with the line of motion, ranging from ten to thirty-five degrees, which insures very smooth work.

What I claim as my invention, and desire to secure by Letters Patent, is-

The construction and arrangement ot the dovetail-cutters, the Vcutter's, the stops P and r, the base from which to set the mitercutters e c, the oblique position of the cutteredges, and the base it, in combination with the adjustable bed-plates G G', substantially as described.

FRANKLIN A. GLEASON.

Witnesses Units. E. Louw, Rona?. MCGILL. 

